Table 8. Spatial extent of seafloor trawled in the Hatton - Rockall area during 2005: overlapping tracks not merged.

Speeds (knots)	Area trawled based on *125 m gear width (km2)	Area trawled based on *80 m gear width (km2)	Area trawled based on **22 m gear width (km2)
13.0–5.0	21,346	13,631	3,738
11.5–4.5	27,487	17,619	4,855
22.0–3.0	4,255	2,711	741
31.5–5.0	37,160	23,855	6,585

Estimates based on 28 vessels engaged in bottom trawling, identified from speed profiles and pattern of activity. All overlapping tracks included in estimate.

*Dick Ferro, Fisheries Research Services, Aberdeen, personal communication.

**Hall-Spencer et al., 2002 [39].

¹Davies et al., 2007 [3].

²ICES, 2007 [38].

³1.5–5.0 knots encompasses the range of bottom trawling speeds referred to by Davies et al., 2007 [3] and ICES, 2007 [38].